<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>MyOJ - 在线编程平台</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-color: #f5f5f5;
            text-align: center;
        }
        
        .container {
            max-width: 800px;
            margin: 100px auto;
            padding: 20px;
            background-color: white;
            border-radius: 5px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        
        h1 {
            color: #333;
            margin-bottom: 20px;
        }
        
        p {
            color: #666;
            margin-bottom: 30px;
        }
        
        .btn {
            display: inline-block;
            background-color: #4CAF50;
            color: white;
            padding: 10px 20px;
            text-decoration: none;
            border-radius: 4px;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>欢迎来到 MyOJ 在线平台</h1>
        <p>一个简洁的在线编程练习平台</p>
        <a href="/all_questions" class="btn">开始练习</a>
    </div>
</body>
</html>